Maricopa, Arizona Air Quality

Maricopa County, Arizona (AZ)

↑ Worseningover 10 years

Air Quality Grade

9/100

Current Median AQI

Moderate

5-Year Avg AQI

10-Year Change

Worse

126

Unhealthy Days/yr

5-year average

Ozone

Primary Pollutant

Ground-Level Ozone

10-Year AQI Trend

The solid line shows the median AQI each year. The dashed line shows the 90th percentile (worst 10% of days). Air quality in this area has been declining over the past decade.

Air Quality Day Breakdown

Number of days per year in each EPA AQI category. Green = Good (AQI 0-50), Yellow = Moderate (51-100), Orange = Unhealthy for Sensitive Groups (101-150), Red = Unhealthy or worse (151+).

Year-by-Year Data

Year	Median AQI	90th Pct	Max AQI	Good Days	Moderate	Unhealthy+	Pollutant
2023	72	119	183	41	256	68	Ozone
2022	75	136	264	27	242	96	Ozone
2021	122	213	297	12	128	225	Ozone
2020	112	216	282	11	154	201	Ozone
2019	67	101	147	50	277	38	Ozone
2018	71	115	274	49	252	64	Ozone
2017	71	108	173	38	272	55	Ozone
2016	67	101	227	47	282	37	Ozone
2015	66	100	147	62	267	36	Ozone
2014	69	108	246	32	288	45	Ozone

What This Means for Maricopa County Residents

Maricopa, Arizona has received an Air Quality Grade of F (9/100) based on a decade of EPA monitoring data. The current median AQI of 72 falls in the "Moderate" range.

Concerning trends show air quality has been declining, with the median AQI rising by 3 points over the monitoring period. This could be driven by increased development, wildfire smoke, or industrial activity.

The primary pollutant affecting this area is Ground-Level Ozone. Over the past 5 years, this area has averaged 126 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.